Good evening together and another happy new year. After my Suzuki Liana 1.3 broke out the error P0400 and the engine control light became active, I got an AGR valve as the current seemed problematic. After the installation and cleaning of the remaining lines, the MKL appeared again and as a mistake P0400. I am a bit perplexed at the moment, especially since the car drives normally, but something stinks. Where should I start with the further test? Thanks and mfg